Answers

2014-04-20T10:04:09+05:30
In radiation charge particles in atoms vibrate are produce Electromagnetic waves and so heat (energy) is transferred
While in conduction heat is transferred by physical contact
and in convection heat is tranferred by he fluid motion that is mass is transferred
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2014-04-20T10:08:11+05:30
 there is no need of medium for movement of radiation while in conduction and convection  medium is always present ex. of radiation is sunlight.

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